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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">CURLOPT_UNIX_SOCKET_PATH - set Unix domain socket <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0">&#35;include &lt;curl/curl.h&gt; 
<p class="level0">CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UNIX_SOCKET_PATH, char *path); <a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">Enables the use of Unix domain sockets as connection endpoint and sets the path to <span Class="emphasis">path</span>. If <span Class="emphasis">path</span> is NULL, then Unix domain sockets are disabled. An empty string will result in an error at some point, it will not disable use of Unix domain sockets. 
<p class="level0">When enabled, cURL will connect to the Unix domain socket instead of establishing a TCP connection to a host. Since no TCP connection is created, cURL does not need to resolve the DNS hostname in the URL. 
<p class="level0">The maximum path length on Cygwin, Linux and Solaris is 107. On other platforms it might be even less. 
<p class="level0">Proxy and TCP options such as <a Class="manpage" href="./CURLOPT_TCP_NODELAY.html">CURLOPT_TCP_NODELAY</a>are not supported. Proxy options such as <a Class="manpage" href="./CURLOPT_PROXY.html">CURLOPT_PROXY</a>have no effect either as these are TCP-oriented, and asking a proxy server to connect to a certain Unix domain socket is not possible. <a name="DEFAULT"></a><h2 class="nroffsh">DEFAULT</h2>
<p class="level0">Default is NULL, meaning that no Unix domain sockets are used. <a name="PROTOCOLS"></a><h2 class="nroffsh">PROTOCOLS</h2>
<p class="level0">All protocols except for file:// and FTP are supported in theory. HTTP, IMAP, POP3 and SMTP should in particular work (including their SSL/TLS variants). <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
<p class="level0">Given that you have an nginx server running, listening on /tmp/nginx.sock, you can request a HTTP resource with: 
<p class="level0"><pre class="level0">
&nbsp;   curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, "/tmp/nginx.sock");
&nbsp;   curl_easy_setopt(curl_handle, CURLOPT_URL, "<a href="http://localhost/">http://localhost/</a>");
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<p class="level0">
<p class="level0">If you are on Linux and somehow have a need for paths larger than 107 bytes, you could use the proc filesystem to bypass the limitation: 
<p class="level0"><pre class="level0">
&nbsp;   int dirfd = open(long_directory_path_to_socket, O_DIRECTORY | O_RDONLY);
&nbsp;   char path[108];
&nbsp;   snprintf(path, sizeof(path), "/proc/self/fd/%d/nginx.sock", dirfd);
&nbsp;   curl_easy_setopt(curl_handle, CURLOPT_UNIX_SOCKET_PATH, path);
&nbsp;   /* Be sure to keep dirfd valid until you discard the handle */
</pre>

<p class="level0"><a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
<p class="level0">Since 7.40.0. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a Class="manpage" href="./CURLOPT_OPENSOCKETFUNCTION.html">CURLOPT_OPENSOCKETFUNCTION</a>, <span Class="manpage">unix (7)</span><p class="roffit">
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